A compressed-air–driven water pump you can build in two student-friendly ways:

1. Variant A: Airlift Pump – Inject air at the bottom of a riser; bubbly mixture becomes lighter and rises, lifting water with no moving parts underwater.

2. Variant B: AODD Pump (Air-Operated Double Diaphragm) – Compressed air alternates two diaphragms via a spool valve to draw and discharge water; self-priming and solids-tolerant.

Parts Used:

Common (both variants)

1. Air Compressor + Tank (3–8 bar), FRL (Filter + Regulator + Lubricator)
2. Pressure Gauge, Relief Valve, Ball Valves, PU Hoses & Quick Couplers
3. Flow Control Valve, Silencer/Muffler, Mounting frame & clamps

Variant A — Airlift Pump

1. Riser/Lift Pipe (PVC/SS, Ø 20–32 mm)
2. Air Injector (tee/nozzle) near pipe foot
3. Submergence/Foot Section with strainer
4. Discharge Line + optional non-return valve

Variant B — AODD Pump

1. Dual Diaphragm Pump Body (DIY acrylic/Al plates + rubber/PTFE diaphragms)
2. Air Spool (5/2) with Pilot Valves (or off-the-shelf AODD head)
3. Inlet/Outlet Manifolds with ball/seat check valves
4. Suction Hose (foot strainer) + Discharge Hose